#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 創(chuàng)建網(wǎng)絡(luò)訪問管理器
    QNetworkAccessManager manager;

    // 創(chuàng)建GET請求
    QNetworkRequest request(QUrl("http://www.baidu.com"));

    // 發(fā)送GET請求
    QNetworkReply *reply = manager.get(request);

    // 連接信號槽，處理響應(yīng)
    QObject::connect(reply, &QNetworkReply::finished, [&]()
    {
        if (reply->error() == QNetworkReply::NoError)
        {
            // 獲取請求的 URL
            qDebug() << "Request URL:" << reply->request().url();

            // 輸出請求頭信息
            qDebug() << "Request Headers:";
            QList<QByteArray> requestHeaders = reply->request().rawHeaderList();
            foreach (const QByteArray &header, requestHeaders) {
                qDebug() << header << ":" << reply->request().rawHeader(header);
            }

            // 獲取響應(yīng)碼
            int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
            qDebug() << "HttpStatusCodeAttribute:" << statusCode;

            // 連接是否加密的標(biāo)志
            bool connectionEncryptedAttribute = reply->attribute(QNetworkRequest::ConnectionEncryptedAttribute).toBool();
            qDebug() << "ConnectionEncryptedAttribute:" << connectionEncryptedAttribute;

            // 請求是否來自緩存的標(biāo)志
            bool sourceIsFromCacheAttribute = reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute).toBool();
            qDebug() << "SourceIsFromCacheAttribute:" << sourceIsFromCacheAttribute;

            // HTTP請求是否被允許進(jìn)行流水線處理的標(biāo)志
            bool httpPipeliningAllowedAttribute = reply->attribute(QNetworkRequest::HttpPipeliningAllowedAttribute).toBool();
            qDebug() << "HttpPipeliningAllowedAttribute:" << httpPipeliningAllowedAttribute;

            // 輸出響應(yīng)頭信息
            qDebug() << "Response Headers:";
            QList<QByteArray> responseHeaders = reply->rawHeaderList();
            foreach (const QByteArray &header, responseHeaders) {
                qDebug() << header << ":" << reply->rawHeader(header);
            }

            // 處理響應(yīng)內(nèi)容，這里可以使用 readAll() 方法獲取響應(yīng)內(nèi)容
            // qDebug() << "Response Content:" << reply->readAll();
        } else
        {
            qDebug() << "Error:" << reply->errorString();
        }

        // 釋放資源
        reply->deleteLater();
        QCoreApplication::quit();
    });

    return a.exec();
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    //自定義槽函數(shù)
    void on_finished();
    void on_readyRead();

    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
    QNetworkAccessManager networkManager;   // 網(wǎng)絡(luò)管理
    QNetworkReply *reply;                   // 網(wǎng)絡(luò)響應(yīng)
};

void MainWindow::on_pushButton_clicked()
{
    // 讀入URL地址
    QString urlSpec = ui->lineEdit->text().trimmed();
    if (urlSpec.isEmpty())
    {
        QMessageBox::information(this, "錯誤", "請指定URL");
        return;
    }

    // 格式化URL
    QUrl newUrl = QUrl::fromUserInput(urlSpec);
    if (!newUrl.isValid())
    {
        QMessageBox::information(this, "錯誤", QString("無效URL: %1").arg(urlSpec));
        return;
    }

    // 訪問頁面
    reply = networkManager.get(QNetworkRequest(newUrl));

    // 完成時的槽函數(shù)綁定
    connect(reply, SIGNAL(finished()), this, SLOT(on_finished()));

    // 讀入數(shù)據(jù)的槽函數(shù)綁定
    connect(reply, SIGNAL(readyRead()), this, SLOT(on_readyRead()));

}

void MainWindow::on_finished()
{
    // 獲取響應(yīng)碼
    int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();

    if(statusCode == 200)
    {
        ui->plainTextEdit_2->appendPlainText("響應(yīng)頭數(shù)據(jù):");
        // 輸出響應(yīng)頭信息
        QList<QByteArray> responseHeaders = reply->rawHeaderList();
        foreach (const QByteArray &header, responseHeaders)
        {
            ui->plainTextEdit_2->appendPlainText(header + " : " + reply->rawHeader(header));
        }
    }
}

// 讀入頁面源代碼
void MainWindow::on_readyRead()
{
    ui->plainTextEdit->setPlainText(reply->readAll());
}